ipa: raspberrypi: Non-functional formatting fixes to md_parser_smia.cpp

Adjust source formatting to closer match libcamera guidelines:

- Remove unused header files.
- Switch to C style comments.
- Adjust whitespace for readability.
- Remove retcode local variable usage.

There are no functional changes in this commit.

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/ipa/raspberrypi/md_parser_smia.cpp

@@ -1,31 +1,30 @@
 /* SPDX-License-Identifier: BSD-2-Clause */
 /*
- * Copyright (C) 2019, Raspberry Pi (Trading) Limited
+ * Copyright (C) 2019-2021, Raspberry Pi (Trading) Limited
  *
- * md_parser.cpp - image sensor metadata parsers
+ * md_parser_smia.cpp - SMIA specification based embedded data parser
  */
-
 #include <assert.h>
-#include <map>
-#include <string.h>
 
 #include "md_parser.hpp"
 
 using namespace RPiController;
 
-// This function goes through the embedded data to find the offsets (not
+/*
-// values!), in the data block, where the values of the given registers can
+ * This function goes through the embedded data to find the offsets (not
-// subsequently be found.
+ * values!), in the data block, where the values of the given registers can
+ * subsequently be found.
+ *
+ * Embedded data tag bytes, from Sony IMX219 datasheet but general to all SMIA
+ * sensors, I think.
+ */
 
-// Embedded data tag bytes, from Sony IMX219 datasheet but general to all SMIA
+constexpr unsigned int LINE_START = 0x0a;
-// sensors, I think.
+constexpr unsigned int LINE_END_TAG = 0x07;
-
+constexpr unsigned int REG_HI_BITS = 0xaa;
-#define LINE_START 0x0a
+constexpr unsigned int REG_LOW_BITS = 0xa5;
-#define LINE_END_TAG 0x07
+constexpr unsigned int REG_VALUE = 0x5a;
-#define REG_HI_BITS 0xaa
+constexpr unsigned int REG_SKIP = 0x55;
-#define REG_LOW_BITS 0xa5
-#define REG_VALUE 0x5a
-#define REG_SKIP 0x55
 
 MdParserSmia::ParseStatus MdParserSmia::findRegs(libcamera::Span<const uint8_t> buffer,
 						 uint32_t regs[], int offsets[],
@@ -36,12 +35,13 @@ MdParserSmia::ParseStatus MdParserSmia::findRegs(libcamera::Span<const uint8_t>
 	if (buffer[0] != LINE_START)
 		return NO_LINE_START;
 
-	unsigned int current_offset = 1; // after the LINE_START
+	unsigned int current_offset = 1; /* after the LINE_START */
 	unsigned int current_line_start = 0, current_line = 0;
 	unsigned int reg_num = 0, first_reg = 0;
-	ParseStatus retcode = PARSE_OK;
+
 	while (1) {
 		int tag = buffer[current_offset++];
+
 		if ((bits_per_pixel_ == 10 &&
 		     (current_offset + 1 - current_line_start) % 5 == 0) ||
 		    (bits_per_pixel_ == 12 &&
@@ -49,34 +49,38 @@ MdParserSmia::ParseStatus MdParserSmia::findRegs(libcamera::Span<const uint8_t>
 			if (buffer[current_offset++] != REG_SKIP)
 				return BAD_DUMMY;
 		}
+
 		int data_byte = buffer[current_offset++];
-		//printf("Offset %u, tag 0x%02x data_byte 0x%02x\n", current_offset-1, tag, data_byte);
+
 		if (tag == LINE_END_TAG) {
 			if (data_byte != LINE_END_TAG)
 				return BAD_LINE_END;
+
 			if (num_lines_ && ++current_line == num_lines_)
 				return MISSING_REGS;
+
 			if (line_length_bytes_) {
-				current_offset =
+				current_offset = current_line_start + line_length_bytes_;
-					current_line_start + line_length_bytes_;
+
-				// Require whole line to be in the buffer (if buffer size set).
+				/* Require whole line to be in the buffer (if buffer size set). */
 				if (buffer.size() &&
-				    current_offset + line_length_bytes_ >
+				    current_offset + line_length_bytes_ > buffer.size())
-					    buffer.size())
 					return MISSING_REGS;
+
 				if (buffer[current_offset] != LINE_START)
 					return NO_LINE_START;
 			} else {
-				// allow a zero line length to mean "hunt for the next line"
+				/* allow a zero line length to mean "hunt for the next line" */
 				while (buffer[current_offset] != LINE_START &&
 				       current_offset < buffer.size())
 					current_offset++;
+
 				if (current_offset == buffer.size())
 					return NO_LINE_START;
 			}
-			// inc current_offset to after LINE_START
+
-			current_line_start =
+			/* inc current_offset to after LINE_START */
-				current_offset++;
+			current_line_start = current_offset++;
 		} else {
 			if (tag == REG_HI_BITS)
 				reg_num = (reg_num & 0xff) | (data_byte << 8);
@@ -86,13 +90,13 @@ MdParserSmia::ParseStatus MdParserSmia::findRegs(libcamera::Span<const uint8_t>
 				reg_num++;
 			else if (tag == REG_VALUE) {
 				while (reg_num >=
-				       // assumes registers are in order...
+				       /* assumes registers are in order... */
 				       regs[first_reg]) {
 					if (reg_num == regs[first_reg])
-						offsets[first_reg] =
+						offsets[first_reg] = current_offset - 1;
-							current_offset - 1;
+
 					if (++first_reg == num_regs)
-						return retcode;
+						return PARSE_OK;
 				}
 				reg_num++;
 			} else